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The system must not apply reversed source routing to TCP responses.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22412 | GEN003605 | SV-46156r1_rule | Medium |
| Description |
|---|
| Source-routed packets allow the source of the packet to suggest routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. |
| STIG | Date |
|---|---|
| SUSE Linux Enterprise Server v11 for System z | 2017-08-25 |
Details
| Check Text ( C-43417r1_chk ) |
|---|
| Check the reverse source route settings for the system: # sysctl net.ipv4.conf.all.accept_source_route # sysctl net.ipv4.conf.default.accept_source_route If either setting has a value other than zero, this is a finding. |
| Fix Text (F-39495r1_fix) |
|---|
| Add the entries in /etc/sysctl.conf to disable reverse source routing: # printf "sysctl net.ipv4.conf.all.accept_source_route = 0\n" >> /etc/sysctl.conf # printf "sysctl net.ipv4.conf.default.accept_source_route = 0\n" >> /etc/sysctl.conf Activate the updated settings: # /sbin/sysctl -p /etc/sysctl.conf |